Schloss Greißenegg, Medieval castle in Voitsberg, Austria

Schloss Greißenegg stands on a nearly free-standing rocky hill on the right bank of the Kainach, an outcrop of the Kowald ridge in southern Voitsberg, at Greißenegger Straße 5. A 1680 depiction still shows the bergfried, defensive walls, towers and the old castle chapel; a new chapel was installed in 1693 on the upper floor of the west wing, directly above the entrance hall. The castle is privately owned and houses a Heurigenlokal.

First documented mention appears in 1336, though the property was already associated with Gertrud von Babenberg around 1254 when she received it as a dowry. The castle changed hands several times and evolved from a defensive structure into the building visible today.

The name Greißenegg comes from Andreas Greißenegger, who married into the property in 1458 or 1459 and began enlarging it; in 1463 Emperor Frederick III granted him a Burgfrieden. The castle is also called Unter-Voitsberg, and 1489 records name it "Gschlos auf dem Greysenegk". Today it is privately owned and houses a Heurigenlokal.

The castle stands on a rocky hill on the right bank of the Kainach at Greißenegger Straße 5, in the north of the Kowald cadastral district. The Heurigenlokal occupies the privately owned building, so the grounds are not open as a public monument. Approach from the southern part of Voitsberg.

The 1680 depiction still shows the bergfried, defensive walls, towers and the old castle chapel. In 1693 a new chapel was installed on the upper floor of the west wing, directly above the entrance hall; it received a licence to hold Mass on several days a year in 1755, widened considerably in 1790.